CN106546800B - A kind of charge/discharge current detection circuit applied to fast charge power supply - Google Patents
A kind of charge/discharge current detection circuit applied to fast charge power supply Download PDFInfo
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- CN106546800B CN106546800B CN201710056700.6A CN201710056700A CN106546800B CN 106546800 B CN106546800 B CN 106546800B CN 201710056700 A CN201710056700 A CN 201710056700A CN 106546800 B CN106546800 B CN 106546800B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention provides a kind of charge/discharge current detection circuit applied to fast charge power supply, wherein, switching module is according to the working condition switching signal input connector of current fast charge power supply and the connection relationship of ground potential connecting pin and signal amplification module, if the working condition of current fast charge power supply is charged state, connecting pin is input a signal into connect with the inverting input terminal of signal amplification module, ground potential connecting pin is connect with the non-inverting input terminal of signal amplification module, if the working condition of current fast charge power supply is discharge condition, connecting pin is input a signal into connect with the non-inverting input terminal of signal amplification module, ground potential connecting pin is connect with the inverting input terminal of signal amplification module；One end of detection resistance is connected to signal input connector, and the other end is connect with ground potential, and the electric current realization charge/discharge current detection of detection resistance is flowed through by detecting.The present invention can be achieved at the same time the charge/discharge current detection of fast charge power supply, and circuit structure is realized simply, at low cost.
Description
Technical field
The present invention relates to fast charge power technique fields more particularly to a kind of charge/discharge current inspections applied to fast charge power supply
Slowdown monitoring circuit.
Background technique
In fast charge power supply chip, due to needing while having the function of charging, discharge the two, while the electric current of charge and discharge
It is very big, and be much required to realize and discharge in charging, lead to the charge/discharge current detection circuit of whole system so just
It is very complicated.
In fast charge power supply chip, there are quick charge and repid discharge this 2 functions, a kind of current existing technical solution
It is that different charge/discharge current detection circuits is separately separately provided to this 2 functions, that is, has to just be able to achieve with two sets of circuits
To the current detecting under fast charge power supply charging and discharging state.But this scheme not only wastes the area and cost of chip, but also
The realization circuit of chip is more complicated.
Therefore, it is current for how providing the current detection circuit that one kind is simple and efficient, and can be achieved at the same time charge/discharge
Fast charge field one of the technical problems that are urgent to solve.
Summary of the invention
In view of the above problems, the embodiment of the present invention proposes a kind of charge/discharge current detection electricity applied to fast charge power supply
Road can not only realize the charge/discharge current detection to fast charge power supply simultaneously, and circuit structure is realized simply, at low cost.
Charge/discharge current detection circuit provided in an embodiment of the present invention applied to fast charge power supply, including signal input connect
Connect end, ground potential connecting pin, switching module, signal amplification module and detection resistance；
The switching module, for switching the signal input connector according to the working condition of current fast charge power supply
With the connection relationship of the ground potential connecting pin and the signal amplification module, if the working condition of current fast charge power supply is charging
The signal input connector then connect with the inverting input terminal of the signal amplification module, the ground potential is connected by state
End is connect to connect with the non-inverting input terminal of the signal amplification module, if the working condition of current fast charge power supply is discharge condition,
The signal input connector is connect with the non-inverting input terminal of the signal amplification module, by the ground potential connecting pin and institute
State the inverting input terminal connection of signal amplification module；
One end of the detection resistance is connected to the signal input connector, the other end and ground electricity of the detection resistance
Position connection flows through the charge/discharge current detection of the electric current realization fast charge power supply of the detection resistance by detecting.
Optionally, the switching module is realized by multidiameter option switch MUX.
Optionally, the switching module includes the first multidiameter option switch and the second multidiameter option switch, and described the
The output end of one multidiameter option switch is connect with the inverting input terminal of the signal amplification module, second multidiameter option switch
Output end connect with the non-inverting input terminal of the signal amplification module.
Optionally, the signal amplification module includes operational amplifier OP, first resistor R1 and second resistance R2, and described
One end of one resistance R1 is connected to the output end of first multidiameter option switch, and the other end of the first resistor R1 is connected to
The inverting input terminal of the operational amplifier OP, one end of the second resistance R2 are connected to the reverse phase of the operational amplifier OP
Input terminal, the other end of the second resistance R2 are connected to the signal output end of the operational amplifier OP.
Optionally, the first resistor R1 and/or second resistance R2 is adjustable resistance.
It optionally, further include control module, the control module is connect with the switching module, current for monitoring
The working condition of fast charge power supply, and control instruction is generated according to monitoring result, so that the switching module is according to current fast
The working condition of charging source switches the signal input connector and the ground potential connecting pin and the signal amplification module
Connection relationship.
Optionally, the control module, if be also used to the working condition of current fast charge power supply for electric discharge and charging simultaneously into
Row state, then the voltage signal accessed according to the signal input connector it is positive and negative, determine the reality of current fast charge power supply
Working condition, if the voltage signal that the signal input connector is accessed is positive voltage, it is determined that the reality of current fast charge power supply
Border working condition is discharge condition, if the voltage signal that the signal input connector is accessed is negative voltage, it is determined that current
The actual working state of fast charge power supply is charged state.
Charge/discharge current detection circuit provided in an embodiment of the present invention applied to fast charge power supply is cut by the way that switch is arranged
Change the mold block, realize the detection of test point whether positive voltage or negative voltage, it can at the same realize to the filling of fast charge power supply/
Discharge current detection, and circuit structure is realized simply, it is at low cost, it is easy to use, and then effectively saved the area of chip
And cost.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects of the present invention, feature and advantage can
It is clearer and more comprehensible, the followings are specific embodiments of the present invention.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 is a kind of charge/discharge current detection circuit applied to fast charge power supply provided in an embodiment of the present invention；
Fig. 2 is another charge/discharge current detection circuit for being applied to fast charge power supply provided in an embodiment of the present invention；
Fig. 3 is the concrete structure schematic diagram of the multidiameter option switch MUX in the embodiment of the present invention；
Fig. 4 is another charge/discharge current detection circuit for being applied to fast charge power supply provided in an embodiment of the present invention；
Fig. 5 is the charge/discharge current detection circuit provided in an embodiment of the present invention applied to fast charge power supply in charged state
Under circuit connection diagram；
Fig. 6 is the charge/discharge current detection circuit provided in an embodiment of the present invention applied to fast charge power supply in discharge condition
Under circuit connection diagram.
Specific embodiment
Exemplary embodiments of the present disclosure are described in more detail below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
It is fully disclosed to those skilled in the art.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art
Language and scientific term), there is meaning identical with the general understanding of those of ordinary skill in fields of the present invention.Should also
Understand, those terms such as defined in the general dictionary, it should be understood that have in the context of the prior art
The consistent meaning of meaning, and unless otherwise will not be explained in an idealized or overly formal meaning by specific definitions.
Fig. 1 is a kind of charge/discharge current detection circuit applied to fast charge power supply provided in an embodiment of the present invention.Such as Fig. 1
It is shown, the charge/discharge current detection circuit provided in an embodiment of the present invention applied to fast charge power supply, including signal input connector
10, ground potential connecting pin 20, switching module 30, signal amplification module 40 and detection resistance 50；
The switching module 30, for switching the signal input connection according to the working condition of current fast charge power supply
The connection relationship at end 10 and the ground potential connecting pin 20 and the signal amplification module 40, if the work shape of current fast charge power supply
State is charged state, then connect the signal input connector 10 with the inverting input terminal of the signal amplification module 40, will
The ground potential connecting pin 20 is connect with the non-inverting input terminal of the signal amplification module 40, if the work shape of current fast charge power supply
State is discharge condition, then connect the signal input connector 10 with the non-inverting input terminal of the signal amplification module 40, will
The ground potential connecting pin 20 is connect with the inverting input terminal of the signal amplification module 40；
One end of the detection resistance 50 is connected to the signal input connector 10, the other end of the detection resistance 50
It is connect with ground potential, the charge/discharge current detection of the electric current realization fast charge power supply of the detection resistance 50 is flowed through by detecting.
Charge/discharge current detection circuit provided in an embodiment of the present invention applied to fast charge power supply is cut by the way that switch is arranged
Block is changed the mold, can be achieved at the same time the charge/discharge current detection to fast charge power supply, and circuit structure is realized simply, it is at low cost, make
With convenient, and then the area and cost of chip are effectively saved.
In the embodiment of the present invention, as shown in Fig. 2, the switching module is realized by multidiameter option switch MUX.Specifically
, the switching module includes two multidiameter option switch, respectively the first multidiameter option switch mux1 and the second multichannel
Select switch mux2, wherein the output end of the first multidiameter option switch mux1 is anti-with the signal amplification module 40
The connection of phase input terminal, the output end of the second multidiameter option switch mux2 and the homophase input of the signal amplification module 40
End connection.
In the embodiment of the present invention, referring to fig. 2, the signal amplification module 40 includes operational amplifier OP, first resistor R1
With second resistance R2, one end of the first resistor R1 is connected to the output end of first multidiameter option switch, and described first
The other end of resistance R1 is connected to the inverting input terminal of the operational amplifier OP, and one end of the second resistance R2 is connected to institute
The inverting input terminal of operational amplifier OP is stated, the other end of the second resistance R2 is connected to the signal of the operational amplifier OP
Output end.
Wherein, the signal output end Vout of the signal amplification module 40 can be used as the fast charge power supply charge and discharge it is defeated
Outlet.
The specific structure is shown in FIG. 3 by multidiameter option switch MUX, and the pmos0 and nmos0 in figure form a transmission gate
TG0, pmos1 and nmos1 form a transmission gate TG1, and the input control signal of phase inverter inv is sel_in, phase inverter it is defeated
It is connected to the grid end of nmos0 and pmos1 out, sel_in is connected to the grid end of pmos0 and nmos1 simultaneously, pmos0 and nmos0's
The source that source is connected to in0, pmos1 and nmos1 is connected to in1, and the drain terminal of pmos0, nmos0, pmos1 and nmos1 all connect
It is connected to out.Specifically, when controlling signal sel_in is low level, transmission gate TG0 is opened its working principle, and TG1 is closed, in0
Out is conducting to by TG0.When same sel_in is high level, transmission gate TG1 is opened, and TG0 is closed, and in1 is connected by TG1
To out, the MUX selection of in0 and in1 is thereby realized.
In a specific embodiment of the invention, as shown in figure 4, connecting pin, ground potential connecting pin can be input a signal into
It is connected to the output end of a MUX circuit, and the inverting input terminal of signal amplification module and non-inverting input terminal are connected respectively
It connects at two ends MUX circuit in0 and in1, and two connection types use opposite connection, e.g., the reverse phase of signal amplification module
Input terminal is connected with the end in0 of MUX1, and inverting input terminal is connected with the end in1 of MUX2, signal amplification module it is same mutually defeated
Enter end to be connected with the end in1 of MUX1, inverting input terminal is connected with the end in0 of MUX2, and control signal sel_in can pass through
Number provides, and can also carry out detection judgement automatically.
In the embodiment of the present invention, by control switch switching module 30, so that signal input connector 10 and the ground electricity
Position connecting pin 20 allows hand over the inverting input terminal A or non-inverting input terminal B for being connected to signal amplification module 40, no matter working as in this way
The working condition of preceding fast charge power supply is charged state or discharge condition, which can work normally.It is intelligible, when fast
When the working condition of charging source is charged state, the voltage V of test point is less than 0 negative voltage, when the work shape of fast charge power supply
When state is discharge condition, the voltage V of test point is greater than 0 positive voltage.For details, reference can be made to Fig. 5 and Fig. 6, wherein Fig. 5 is fast charge
The circuit connection diagram of power supply in the charge state, Fig. 6 are the circuit connection diagram of fast charge power supply in the discharged condition.
Wherein, I is the electric current for needing to detect, and Rx is external detection resistance 50.
Due to electric current I very little, signal is needed exist for amplify, therefore resistance R1 and R2 and operational amplifier OP composition increases
Beneficial amplifier can amplify the signal amplitude of V.Amplification factor is R2/R1.
Further, in order to realize that gain is adjustable, first resistor R1 and/or the second resistance R2 be can be set to
Adjustable resistance, Vout output gain are then adjustable.
In the embodiment of the present invention, the charge/discharge current detection circuit applied to fast charge power supply further include in attached drawing not
The control module shown, in a specific embodiment, the control module can be realized using MCU.The control module
It is connect with the switching module 30, for monitoring the working condition of current fast charge power supply, and is generated and controlled according to monitoring result
System instruction, so that the switching module 30 switches the signal input connector according to the working condition of current fast charge power supply
10 and the ground potential connecting pin 20 and the signal amplification module 40 connection relationship.
In one alternate embodiment, if the working condition of current fast charge power supply is electric discharge and charging while carrying out state,
The then control module, the voltage signal for being also used to be accessed according to the signal input connector it is positive and negative, determine current fast
The actual working state of charging source, if the voltage signal that the signal input connector is accessed is positive, it is determined that current fast charge
The actual working state of power supply is discharge condition, if the voltage signal that the signal input connector is accessed is negative, it is determined that
The actual working state of current fast charge power supply is charged state.Then the switching module 30 is also used to according to current fast
The actual working state of charging source switches the signal input connector 10 and the ground potential connecting pin 20 is put with the signal
The connection relationship of big module 40, so realize to fast charge power supply while charging, while discharge condition under current detecting.
It should be noted that detection circuit provided in an embodiment of the present invention, is applicable not only to the charge/discharge to fast charge power supply
Current detecting applies also for realizing to the charge/discharge voltage detecting of fast charge power supply or needs signal to amplify suitable for other
Circuit.
Charge/discharge current detection circuit provided in an embodiment of the present invention applied to fast charge power supply is cut by the way that switch is arranged
Change the mold block, realize be positive to test point, the detectable technical effect of negative current (voltage), it can while realize to fast charge
The charge/discharge current of power supply detects, easy to use, and circuit structure is realized simply, is saved pin, has effectively been saved chip
Area and cost.
In specification of the invention, numerous specific details are set forth.It is to be appreciated, however, that the embodiment of the present invention can be with
It practices without these specific details.In some instances, well known method, structure and skill is not been shown in detail
Art, so as not to obscure the understanding of this specification.
In addition, it will be appreciated by those of skill in the art that although some embodiments described herein include other embodiments
In included certain features rather than other feature, but the combination of the feature of different embodiments mean it is of the invention
Within the scope of and form different embodiments.For example, in the following claims, embodiment claimed is appointed
Meaning one of can in any combination mode come using.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme should all cover within the scope of the claims and the description of the invention.
Claims (5)
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710056700.6A CN106546800B (en) | 2017-01-25 | 2017-01-25 | A kind of charge/discharge current detection circuit applied to fast charge power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710056700.6A CN106546800B (en) | 2017-01-25 | 2017-01-25 | A kind of charge/discharge current detection circuit applied to fast charge power supply |
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| CN106546800A CN106546800A (en) | 2017-03-29 |
| CN106546800B true CN106546800B (en) | 2019-06-18 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108845181A (en) * | 2018-07-09 | 2018-11-20 | 珠海市微半导体有限公司 | current detection circuit and detection method |
| CN108594004A (en) * | 2018-07-09 | 2018-09-28 | 珠海市微半导体有限公司 | bidirectional current detection circuit and detection method |
| CN109030928A (en) * | 2018-07-09 | 2018-12-18 | 珠海市微半导体有限公司 | For carrying out the circuit and electric current detecting method of bidirectional current detection |
| CN116223896A (en) * | 2023-02-06 | 2023-06-06 | 深圳市华思旭科技有限公司 | Current Sensing Circuits and Power Supplies |
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